碳含量对Fe-15Mn-4.5Si-10Cr-5Ni-C系形状记忆合金性能的影响机制

doi:10.13228/j.boyuan.issn0449-749x.20200239

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Abstract In order to obtain shape memory alloy with excellent shape memory performance by regulating carbon content,microstructure,mechanical properties and shape memory effect of Fe-15Mn-4.5Si-10Cr-5Ni-C-based alloys with three different carbon contents in solution aging state were studied. The results showed that the shape memory effect of Fe-15Mn-4.5Si-10Cr-5Ni-(0.05~0.2) C alloys increased first and then decreased with the increase of carbon content. It caused by several reasons. One is that the interstitial solution strengthening of carbon atoms and the precipitation strengthening of second phase carbides increase the strength of austenitic matrix with the increase of carbon content,which inhibits the occurrence of irreversible plastic deformation. In other word,strengthening of austenitic matrix facilitates the stress-induced martensitic transformation of the alloys under stress. On the other hand,the complete solution temperature increases with the increase of carbon content. Then,the relatively large austenite grains obtained after solid solution treatment reduced the strength of austenitic matrix. In addition,with the increase of carbon content,the temperature of martensitic phase transformation point (M_εs) decreased,and the strain-induced phase transformation process was inhibited,which was not conducive to the shape memory effect. Under the influence of different mechanisms,the shape memory effect of the experimental alloys in the solution aging state with a carbon mass percent of 0.091 8% was the best.

Key words： shape memory alloy shape memory effect martensitic transformation Cr₂₃C₆ solution and aging treatment

Received: 06 May 2020

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	ZHAO Kai
	YANG Zhong-min
	WANG Wen-tao
	CHEN Ying
	CAO Yan-guang
	LI Zhao-dong

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ZHAO Kai,YANG Zhong-min,WANG Wen-tao等. Effect mechanism of carbon content on properties of Fe-15Mn-4.5Si-10Cr-5Ni-C-based shape memory alloy[J]. Iron and Steel, 2021, 56(2): 117-125.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200239 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I2/117

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